Tool-holder.



ALF. MARGONINI.

TOOL HOLDER.

APPLIOA TION FILED APR. 28, 1910.

9809 869;. Patented Jan. 3, 1911.

IN VE/VTOR An/fin; 2 7M arconz'ni BEST AVAILABLE CQPY s'ra'ras PATENTornron.

ANTONI F. MARCONINI, or VICTORIA, BRITISH COLUMBIA, CANADA.

TOOL-HOLDER.

Specification of Letters Patent.

Patented Jan. 3, 1911.

Application filed April 28, 1910. Serial No. 558,259.

To all whom it may concern! Be it known that I, ANTONI F. MAnooNINI, acitizen of the Dominion of Canada, residing at Victoria, in the Provinceof British Columbia, Canada, have invented a new and useful Tool-Holder,of which the following is a specification.

This invention relates to a tool holder such as is used to hold a smallpiece of special tool steel for cutting metal, and my object has been toprovide a means whereby the cutting tool is securely held in a mannerthat the pressure of the cut will tighten the securing means and thathas provision for adjustment and can be simply and quickly released fromthe holder.

The invention is particularly described in the following specification,reference being made to the drawings by which it is accompanied, inwhich:

Figure l is a side elevation showing the holder, the cutting tool andits tightening and adjusting wedges, Fig. 2 is a plan of the same, andFig. 3 is a section on the line A A in Fig. 1.

In these drawings 2 represents the cutting tool, 3 the holder and 4 and7 the supporting and securing wedges by which it is adjustably heldtherein.

The cutting tool 2 of any special steel is preferably square in crosssection. Itscutting edges are formed by the oblique grinding of the end,and the clearance by the angle at which it is set in relation to theaxis of the tool holder.

The holder 3, which is secured in any suitable manner to the tool restof the tool box of the machine, is preferably made of ordinary toolsteel of square cross section. It is provided at the end with anelongated rectangular aperture the sides of which are parallel and havea Width adapted to receive the cutting tool 2. The front end of theaperture against which the tool 2 is secured is angled to give therequired clearance to the tool and the back end of it is angled inrelaion to the front end to conform to the taper "v ce the holder.

on which shoulder the bottom end of that tool is designed to rest, andacrossthe other face of the wedge are aseries of 'fine ratchet teeth 6the engaging faces of .which an" directed downward.

The contiguous face of the tightenin wedge 7 has corresponding opposedteeth 6 so that 4 will transmit any downward pressure on it to 7 andthrough 7 to the back end face of the aperture the taper of whichconforms to the taper of the wedge.

The action of the securing means can no" be readily followed. Onreferring to Fig. it will be readily seen that the downwar. pressure ofthe cut on 2 is transmitted posi tively through the shoulder 5 to thewedg. member 4: and therefrom through the ratche teeth 6 to thetightening wedge 7 so that ar tendency to move downward on the part thecutting tool under the strain of the c at once tightens the cutter moresecurely This tightening is not due the frictional grip between thecutter 2 the wedges but to the positive en agem therebetween. The cutter2 may e mi or lowered in the holder the taper of the wedges 4 and 7enabling t'thecut-ter to be tightened in that adjustment.

Having now particularly described my invention and the manner of itsconstruction and use, I hereby declare that what I claim as new anddesire to be; protected in by Letters Patent, is: i

1. In a tool holder, the combination with a cutting tool having uniformcross sectional dimensions, of a holder for attachment of the same tothe tool rest of the machine said holder having an elongat zed apertureof uniform width but tapered end, we ges for securing the cutters in theaperture said wedges having a positive endwse engagement with oneanother and the "one near the cutter having .ashoulder on which-th lowerend of the cuttimg tool bears.

2. In a tool holder, the combination wit a cutting tool, of a we dgemember having shoulder against which the lower end of tt utt r bears andon the face against BEST AVNLABLE COPY directed, a second Wedge memberhaving op- I name to this specification in the presence of posedcorrespondlng serratlons and a hold- 1 two subscrlblng WltIIQSSGS.

ing member havin an aperture to receive 1 I T T T togethel: the cuttingtool and Wedges and a ANTOLI MARCOL 5 tapered end to correspond with thetaper of W itnessesz the wedges. C. L. HARRISON,

In testimony whereof I have signed my RICHARD C. LEWE.

